diff --git a/src/librustc_error_codes/error_codes/E0271.md b/src/librustc_error_codes/error_codes/E0271.md index 31334069ed8a4..ddd245b1a2b1b 100644 --- a/src/librustc_error_codes/error_codes/E0271.md +++ b/src/librustc_error_codes/error_codes/E0271.md @@ -5,25 +5,6 @@ Erroneous code example: ```compile_fail,E0271 trait Trait { type AssociatedType; } -fn foo(t: T) where T: Trait { - println!("in foo"); -} - -impl Trait for i8 { type AssociatedType = &'static str; } - -foo(3_i8); -``` - -This is because of a type mismatch between the associated type of some -trait (e.g., `T::Bar`, where `T` implements `trait Quux { type Bar; }`) -and another type `U` that is required to be equal to `T::Bar`, but is not. -Examples follow. - -Here is that same example again, with some explanatory comments: - -```compile_fail,E0271 -trait Trait { type AssociatedType; } - fn foo(t: T) where T: Trait { // ~~~~~~~~ ~~~~~~~~~~~~~~~~~~ // | | @@ -56,11 +37,9 @@ foo(3_i8); // therefore the type-checker complains with this error code. ``` -To avoid those issues, you have to make the types match correctly. -So we can fix the previous examples like this: - +The issue can be resolved by changing the associated type: +1) in the `foo` implementation: ``` -// Basic Example: trait Trait { type AssociatedType; } fn foo(t: T) where T: Trait { @@ -70,13 +49,17 @@ fn foo(t: T) where T: Trait { impl Trait for i8 { type AssociatedType = &'static str; } foo(3_i8); +``` -// For-Loop Example: -let vs = vec![1, 2, 3, 4]; -for v in &vs { - match v { - &1 => {} - _ => {} - } +2) in the `Trait` implementation for `i8`: +``` +trait Trait { type AssociatedType; } + +fn foo(t: T) where T: Trait { + println!("in foo"); } + +impl Trait for i8 { type AssociatedType = u32; } + +foo(3_i8); ```